The creator of RC Mod, RC himself, did indeed make a side project to 'work on' after he was done with Attack on Titan Tribute Game's RC mod. However, production on this has hit a standstill over the years, and since has no updates.

The domain for the game has since been changed, acquired by a different party, or just lost by RC over the years. Perhaps he didn't feel it was worth paying for. The old web domain for the game was;

However, it looks like RC himself gave up and canned the project, due to lack of interest from the AOTTG community (that, or he didn't want to make a fool of himself trying to get people interested or advertising for it) so the site is no longer operational. It's since been considered unsuccessful after that, and since the site is gone along with the consumer interest, the chances of finding a copy of it online is scarce. With a bit of google searching, I'm sure you could find it, but be careful of viruses and the like; Project Voltage isn't exactly the most foundational name in the world.

It was up for a long time, but it seems to be completely gone now, sorry about that. ):

_________________-And now I try again my hand, at taming ghosts and counting sand.I'll meet you on the other side, but hey- It's one in a million.